Galeopsomyia ventrosa Hansson sp.nov. (Figs 618, 619, 1100) Diagnosis (female). Antennal clava with a weak constriction between C1 and C2 (Fig. 1100); genal carina present; mesoscutellum (Fig. 618) with weak reticulation on median part and with a weak median groove in anterior two-thirds, lateral parts with strong reticulation, meshes elongate, submedian grooves distinct, straight and parallel; dorsellum with median carina; propodeum (Fig. 618) medially with a few strong irregular carinae, laterally with strong reticulation, callus with six setae; petiole transverse with strong sculpture on dorsal surface; gaster (Fig. 618) 3.1× as long as wide, medio-basal Gt1 with longitudinal sharp edges laterally, tergites with strong reticulation. Female holotype: length of body 3.0mm. Scape yellowish-brown, pedicel pale brown, flagellum dark brown. Face below level of toruli golden-green, clypeus dark brown, frons metallic bluish-green, antennal scrobes black. Thoracic dorsum metallic bluish-green. Legs with fore coxa dark brown with metallic blue tinges, mid coxa dark brown, hind coxa golden-green; trochanters dark brown; femora dark brown with apex yellowish-brown; tibiae yellowish-brown; T1–3 yellowish-brown, T4 pale brown. Petiole black. Gaster with Gt 1 golden-green, Gt2-5 golden-purple, Gt6 metallic bluish-green, Gt 7 black; gonoplac black. Antenna with a weak constriction between C1 and C2. Face below level of toruli with weak reticulation, clypeus smooth, frons rugose, antennal scrobes with weak reticulation; with genal carina. Vertex with strong reticulation outside ocellar triangle, with wrinkled sculpture inside ocellar triangle. Occipital margin with a carina behind ocellar triangle. Mesoscutum with strong reticulation, meshes isodiametric on sidelobes, elongate on midlobe, midlobe rugose close to notauli; midlobe with a median groove in posterior two-thirds, with 16 scattered setae on rugose parts. Mesoscutellum with weak reticulation on median part and with a weak median groove in anterior two-thirds, lateral parts with strong reticulation, meshes elongate; submedian grooves distinct, straight and parallel; with six setae scattered over lateral parts. Dorsellum with strong reticulation, with median carina. Propodeum medially with a few strong irregular carinae, laterally with strong reticulation; callus with six setae. Fore and hind coxae with strong reticulation, mid coxa with weak reticulation. Fore wing with 4&5 setae on dorsal surface of submarginal vein; speculum closed; costal setal row broken. Petiole transverse with strong sculpture on dorsal part. Gaster elongate; medio-basal Gt 1 with longitudinal sharp edges laterally; tergites with strong reticulation. Relative measurements: head length, dorsal view 26; head length, frontal view 45; POL 11; OOL 7; lateral ocellus diameter 6; head width 59; mouth width 20; malar space 17; eye length 27; scape length 21; scape width 5; pedicel+flagellum length 62; pedicel length 8; pedicel width, dorsal view 4.5; F1 length 9; F1 width 6; F2 length 10.5; F2 width 6; F3 length 10; F3 width 6; clava length 21.5; clava width 6.5; C3 length 7; spicule length 2; mesosoma length 80; mesosoma width 60; midlobe of mesoscutum length 33; mesoscutellum length 29; mesoscutellum width 27; median part of mesoscutellum width (measured medially) 11.5; median part of mesoscutellum, width in anterior part11.5; median part of mesoscutellum, width in posterior part 12; lateral part of mesoscutellum, width (measured medially) 5.5; dorsellum length 4; propodeum length 12; costal cell length 41; costal cell width (measured at widest part) 3; marginal vein length 34; stigmal vein length 11; gaster length 137; gaster width 44; Gt 2 length (measured medially) 11; Gt 4 length (measured medially) 18; Gt 7 length (measured medially) 26; Gt 7 width (measured at base) 16; longest cercal seta length 16; shortest cercal seta length 7. Male. Unknown. Hosts. Reared from leaf galls (swelling of veins) induced by an unidentified Agromyzidae (Diptera) on Casearia commersoniana (Salicaceae). Distribution. Costa Rica. Material examined. Holotype ♀ COSTA RICA, San José, Universidad de la Paz, xii.2004, from agromyzid leaf gall on Casearia comers., P. Hanson (NHMUK).

Published as part of Hansson, Christer & Hanson, Paul E., 2023, EULOPHIDAE OF COSTA RICA (HYMENOPTERA: CHALCIDOIDEA), 5: The genus Galeopsomyia Girault, pp. 1-743 in Taxonomic Monographs on Neotropical Hymenoptera (Oxford, England) (Oxford, England) 3 (1) on pages 465-466, DOI: 10.5281/zenodo.8372024